Mechanical detachable hand and forearm



1927. lMay 31, L SMITH MECHANICAL DETACHABLE lHAND AND Fons [uml FiledOct. 6, 1926 2 Sheets-Sheet 1 Ma 3l 1927.

y J. SMITH MECHANICL DETAGHABLE HAND AND FORE ARM Filed oct. e', 132e 2sheets-snee*v 2 zu J '1 Vchanical hand Which Vcani-be'"locked toanV Yartificiali forea r1 n, fthe handibeingof the` type in 4which eachngerand .thumb'lcom-- prises a spiralv spring .it/ith ai flexibleltension eWire between fthepalm vand .the tips.; ofthe i finger andgthumb andextending along theV V.palm iside' of each finger and; thumb,y thefingers and thumb being openediand closed byfa flat spring extendingfrom the `tip'V ofv the `finger "or thumb to a, movable plate iar-Vran'ged Within the Vpalmbflthe hand, the? plate" =beingpreferably'operated by a..conv

Alamented Mayl 315,192.7, f

" "JAMESTSMITH, .QF

'My invention relates'to" an artificialme# fingers; kFigure isVan:edgej,vieW ,oyffgthe nectin'g link `from `a piyfot'efdratchet 'sector'which is operated by Va .Wird/and locked-in] any position bya'springdetent controlled,

by a ro d pro] ecting o utjwith the hand `and has`forYyitsobject'to'improye :the 'construcvy tion andvaction Aof such'hands.,f 'L

According *to Athe present invention Jthe Y flat springs yareVmoyed`outwards ,againstthe action ofy the spiral spring `:fingers7 f on.guide rods provided with* sho'k ,-iabsorbing A springs, by the.nsual'conn'ecting link and v bellcrank -[leVer. VThe thumb is:provided?V A with V:the usual' fiat spring, if andthe inner end Y ofthis spring -is r connected to'.n a? blockv slid-, x `ing on a guideirod,-eaidifblock'beingriconf.. Vnect'ed by -ar'od to theftransverseplates',` thelrod having an; elongated vs lot formed in A itl so thatapredeterminedgmovement io-fnzthel fingers takes placefbeforeltheeithumb? isf v`vwardsith'efingerscz'iuse".,thefiat-spiingseff6,;=A :to curve,therebyi,dlosingtheingersgwhil'st l thepspriiig's 85%,' .'effectla"cushioningw actfionfl v-g-y Y f between the clampingplatesf, and-thestops. r

' l M'vllie improyed-f arlticial fhand is detach?. able-from' theartificial' Vfore-arm, in order;- that another mechanical gripper can-beat.

taehed lto the'for'e-arm when required. The

Wrist of the detachable hand is locked tothefore-armby means of alocking pin en-y gaging Va looking platefand a balllbearing may beforniedbetween .thcbandfad the.

l end of aurod 13,;th'e rotherendlofsaid rodA fore-arm.v

' v,In .order'that iny'SaidinventionA andthe manner ofv performingthejsame :may lbeYV .properly understood,:1I` hereunto append two Sheetsv'of explanatory;drawings" to be hereinafter referred to Adescribingy myinvention. l

1 .Whichmay beeonveniently j made fr v a f exblenextensible connection5,- Wil may vbeiof vvBowden Wire; fsteeL n,. ;or t i'corda orrisimilarmaterialithisflexibleQconv v nebtion i 5, `extendingl alongfzthepalmside of excepttowards the palmqofithe hand. 5

connecting ered;vk

transyerse movable members,`r Ilignrev 4, isl

a' plan view-of a combined farti-cialvhalld .ofnfthe lockingplateautrhej f'Qrgalm` In K these drawingsfthefsame reference numeralsWhereyer-theyiare :repeatedi Referring :to 4the ,dnawi gs', 1,,Clesgllttes andtextendingaffrom,:the tip @fiieach ,fingenl and 'thinnbItQ- the shell oripalmplateflfis f Vich eachfspiral s} ringv finger63"1` and spiral l v sprm'gthnmb 4.1;; Thelconnections@,Lpref I'.Ventthe lingersfandlthumb freni: bending 2" i" Springs 6, Vextend alongeach finger, and

parallelrods provided: With/springsiSfi;

Said-rods beingsecnred'atone -endigto posts L-"fandVV fat the otherendftfoprojectionsg-lO,

projeqtingnomine palm platea., Ther 10,V and so absorb4 anyshock,

rod 1Q," saidzblock being connectedto one :ai

transyerefejmembers impart'a-predetermined'5v j embers

